New York City Mayor Bill de Blasio

The mayor announced his run with a video released by his campaign. "There's plenty of money in this world. There's plenty of money in this country. It's just in the wrong hands," de Blasio says at the beginning of the video.

He concludes: "I'm running for president because it's time we put working people first."

Sen. Michael Bennet

The moderate Democrat from Colorado had been moving toward a presidential run late last year but paused while he was being treated for prostate cancer. He announced he was joining the 2020 primary field during an appearance on “CBS This Morning” on May 2, 2019.

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Bennet will be competing against his state’s governor, John Hickenlooper, for whom Bennet served as chief of staff when Hickenlooper was mayor of Denver.

Bennet, in a video about his launch, took issue with some of his more liberal opponents, saying “I”m not going to pretend free college is the answer.” He is also opposed to the push for single-payer health care, instead proposing letting Americans buy into Medicare through health care exchanges.

Former Vice President Joe Biden

In a video posted on Twitter, Biden focused on the 2017 deadly clash between white supremacists and counter protesters in Charlottesville, Virginia. Biden noted Trump's comments that there were some "very fine people" on both sides of the violent encounter, which left one woman dead.

Rep. Seth Moulton

Massachusetts lawmaker and Iraq War veteran Rep. Seth Moulton is the latest Democrat to jump in the race for the White House. He made the announcement on his website on April 22, 2019. Moulton first came to prominence in 2014 when he unseated long-term incumbent Rep. John Tierney in a Democratic primary and went on to represent the state's 6th Congressional District, a swath of communities north of Boston including Salem, home of the infamous colonial-era witch trials.

Rep. Tim Ryan

"I'm a progressive who knows how to talk to working class people, and I know how to get elected in working class districts, because, at the end of the day, the progressive agenda is what's best for working families," Ryan said on the show.

Miramar Mayor Wayne Messam, left, tours a local business on March 27, 2019. (Brynn Anderson/AP)

Mayor Wayne Messam

The mayor of Miramar, a city in South Florida, announced in a video on March 28 that he is joining the crowded field of Democratic candidates.

Messam was a wide receiver on Florida State University’s 1993 national championship team. He owns a construction business and became the first African-American mayor of Miramar, Florida’s 13th-largest city, The Sun Sentinel reported.

Former Texas congressman Beto O'Rourke speaks to local residents during a meet and greet at the Beancounter Coffeehouse & Drinkery on March 14, 2019, in Burlington, Iowa, after announcing his presidential r un. (Charlie Neibergall/AP)

Beto O’Rourke

Former U.S. Rep. Beto O’Rourke, who took social media by storm in his failed bid to unseat Republican Sen. Ted Cruz, announced on March 14 he was officially in the race.

O’Rourke, who repped an El Paso, Texas, congressional district, ended months of intense speculation over whether he'd try to translate his new political celebrity into a White House bid, despite his loss to Cruz in deep red Texas.

Former Colorado Governor John Hickenlooper speaks to supporters during his campaign kick-off rally for the 2020 presidential race at Civic Center Park in Denver, Colorado on March 7, 2019. - (Jason Connolly/Getty-AFP)

Gov. Jay Inslee

The relatively unknown Governor of Washington of Jay Inslee announced he was joining the field on March 1, 2019, pledging to make climate change the primary issue in his campaign. Inslee, 68, is the first governor to enter the Democratic contest and has a long political resume, but lacks name recognition outside of the Pacific Northwest.

Sen. Bernie Sanders

"Our campaign is not only about defeating Donald Trump," the 77-year-old self-described democratic socialist said in an email to supporters. "Our campaign is about transforming our country and creating a government based on the principles of economic, social, racial and environmental justice."

Democratic Sen. Amy Klobuchar, laughs as she addresses a snowy rally where she announced she is entering the race for president on Feb. 10, 2019, at Boom Island Park in Minneapolis. (Jim Mone/AP)

Sen. Amy Klobuchar

The Minnesota senator positioned herself as the most prominent Midwestern candidate in the field as she announced her candidacy Sunday, Feb. 10, 2019, in a snowy park along the Mississippi River with the Minneapolis skyline in the background.Klobuchar made the announcement after severalstories about her alleged mistreatment of Capitol Hill staff put a dent in her “Minnesota nice” reputation.

Sen. Elizabeth Warren

The Massachusetts senator became the first prominent candidate to dip a toe into the race, announcing in an email to supporters on Dec. 31, 2018, that she was forming an exploratory committee. She made it official on Feb. 9, 2019, that she was after the Dem nomination and the White House.

The progressive candidate’s initial move came two months after a widely-criticized decision to release a DNA test to prove her claim to Native American heritage, a topic Trump has routinely used to attack her. She formally announced her candidacy at a rally in Lawrence, Mass., after a series of stops, with some big turnout, in states like Iowa.

South Bend Mayor Pete Buttigieg holds a rally to announce his run for president in the 2020 election at Studebaker Building 84 in downtown South Bend on April 14, 2019. (Zbigniew Bzdak/Chicago Tribune)

Mayor Pete Buttigieg

At 37-years old, Buttigieg is only a few years older than the age requirement to be commander-in-chief, which is 35. He is a former Rhodes scholar and veteran of the war in Afghanistan and would be the first openly gay nominee from a major party. He ran unsuccessfully in 2017 for chairman of the Democratic National Committee.

Sen. Kamala Harris holds a news conference following her announcement that she will run for president on Jan. 21, 2019. (Manuel Balce Ceneta/AP)

Sen. Kamala Harris

The first-term senator from California, where she was the former attorney general, entered the race on Martin Luther King Jr. Day. Harris, if successful, would be the first woman African American to win the nomination.

Harris bypassed the traditional route of launching an exploratory committee. During a recent TV appearance to promote her new book, “The Truths We Hold,” Harris described Washington as a “hot mess,” saying she was raised to fix problems.

Julian Castro, former U.S. Department of Housing and Urban Development Secretary and San Antonio mayor, announces his candidacy for president on Jan. 12, 2019, in San Antonio, Texas. (Edward A. Ornelas/Getty Images)

Julian Castro

The former mayor of San Antonio and secretary of housing and urban development under President Barack Obama officially entered the race on Jan. 12.

The first Latino to enter the race made immigration the focus of his announcement, attacking Trump’s policies and his push for a border wall.

U.S. Rep. Tulsi Gabbard, D-Hawaii, second from left, celebrates with supporters after announcing her candidacy for president in Waikiki, on Feb. 2, 2019, in Honolulu. (Marco Garcia/AP)

Rep. Tulsi Gabbard

The Hawaii Democrat announced on CNN’s “The Van Jones Show” on Jan. 11 that she would run for the White House, listing criminal justice reform, climate change and health care as issues she wanted to solve.

A week later, she apologized to LGBTQ people after criticism of her past comments and work against gay rights resurfaced. She had apologized previously, saying she has evolved on the issue.

Marianne Williamson

Andrew Yang, a candidate in the Democratic primaries for president, speaks at a town hall meeting sponsored in Cleveland on Feb. 24, 2019. (Phil Long/AP)

Andrew Yang

A New York City entrepreneur entered the fray on early, on Nov. 6, 2017. Yang is running on a platform of universal basic income, Medicare For All, and a more humane form of capitalism. Yang is the son of Taiwanese immigrants and attended Exeter boarding school and the Ivy League.

Former Rep. John Delaney speaks to fairgoers during a visit to the Iowa State Fair in Des Moines, Iowa, on Aug. 10, 2018. (Charlie Neibergall/AP)

John Delaney

The little-known former Maryland congressman became the first candidate to officially enter the fray. And he wasted no time doing so, announcing his intent to run in July 2017 in a Washington Post op-ed.